.auth {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 20px;
  background-color: #f5f5f5;
  height: 100vh;
  background-image: url("https://tse1-mm.cn.bing.net/th/id/OIP-C.iK1oYTDTUdm36ftfaiVKnQHaQD?rs=1&pid=ImgDetMain");
  background-size: cover;
  /* 或者指定具体的尺寸，如100px 100px */
}
.auth .head {
  width: 100%;
  height: 100px;
  border-radius: 10px;
  margin-bottom: 200px;
}
.auth .tab {
  position: relative;
  bottom: 0;
  left: 0;
  display: flex;
  align-items: flex-start;
  padding: 10px;
  font-size: 20px;
  width: 100%;
}
.auth .tab span {
  cursor: pointer;
  margin-right: 10px;
  margin-bottom: 10px;
  transition: all 0.3s ease;
}
.auth .tab .avtive {
  font-size: 1.2em;
  font-weight: bold;
  color: #007bff;
}
.auth .form {
  width: 100%;
  margin-bottom: 20px;
}
.auth .operation {
  width: 100%;
  margin-top: 20px;
}
.auth .operation .agree {
  display: flex;
  align-items: center;
  margin-bottom: 15px;
}
.auth .operation .agree label {
  margin-left: 5px;
  font-size: 14px;
  color: #666;
}
.auth .operation button {
  font-size: 16px;
  padding: 10px;
}
